rump_lfs(8) - NetBSD Manual Pages

RUMP_LFS(8)             NetBSD System Manager's Manual             RUMP_LFS(8)


NAME

     rump_lfs -- mount the lfs file system using a userspace server


SYNOPSIS

     file-system PUFFS
     pseudo-device putter

     rump_lfs [options] special node


DESCRIPTION

     The rump_lfs utility can be used to mount lfs file systems.  It uses
     rump(3) and p2k(3) to facilitate running the file system as a server in
     userspace.  As opposed to mount_lfs(8), rump_lfs does not use file system
     code within the kernel and therefore does not require kernel support
     except puffs(4).  Apart from a minor speed penalty (starting from 10% and
     depending on the workload and file system in question), there is no dif-
     ference to using in-kernel code.

     In case mounting a file system image from a regular file, rump_lfs does
     not require the use of vnconfig(8) unlike kernel file systems.  Instead,
     the image path can be directly passed as the special file path.  The
     exception is if the image contains a disklabel.  In this case vnconfig is
     required to resolve the start offset for the correct partition within the
     image.

     It is recommended that untrusted file system images be mounted with
     rump_lfs instead of mount_lfs(8).  Corrupt file system images commonly
     cause the file system to crash the entire kernel, but with rump_lfs only
     the userspace server process will dump core.

     To use rump_lfs via mount(8), the flags -o rump and -t lfs should be
     given.  Similarly, rump_lfs is run instead of mount_lfs(8) if ``rump'' is
     added to the options field of fstab(5).

     Please see mount_lfs(8) for a full description of the available command
     line options.


SEE ALSO

     p2k(3), puffs(3), rump(3), mount_lfs(8)


HISTORY

     The rump_lfs utility first appeared in NetBSD 5.0.  It is currently con-
     sidered experimental.

NetBSD 5.1                     February 15, 2009                    NetBSD 5.1